An Investigation of Winding Curvature Effect on the Mechanical Strength of Transformer Windings

Bakshi, Amit

doi:10.1109/tpwrd.2015.2410775

Cited by 11 publications

(6 citation statements)

References 8 publications

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“…In this expression, it can be verified that the critical stress is dependent on the constructive characteristics of the windings [15], [16], [17].…”

Section: A Von Mises Criterionmentioning

confidence: 99%

Methodology to Evaluate the Electromechanical Effects of Electromagnetic Forces on Conductive Materials in Transformer Windings Using the Von Mises and Fatigue Criteria

Araújo

Costa

Andrade

et al. 2016

IEEE Trans. Power Delivery

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A methodology based on computer simulations and aiming to estimate the lifespan of transformer windings after the occurrence of short circuits is presented in this paper. The Von Mises and fatigue criteria are employed to determine the failure proximity of the windings. The obtained results contribute to the evaluation of the influence of electromechanical effects in transformer windings and to the determination of the number of short circuits that a transformer winding can support. The simulation results may also be employed in the design of transformers and failure diagnosis, to increase the security margin against mechanical failures.

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“…In this expression, it can be verified that the critical stress is dependent on the constructive characteristics of the windings [15], [16], [17].…”

Section: A Von Mises Criterionmentioning

confidence: 99%

Methodology to Evaluate the Electromechanical Effects of Electromagnetic Forces on Conductive Materials in Transformer Windings Using the Von Mises and Fatigue Criteria

Araújo

Costa

Andrade

et al. 2016

IEEE Trans. Power Delivery

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“…There are radial and axial forces acting on the windings in short circuit accidents. Parts of the winding collapse and buckle between the radial strips under the influence of the radially inwards-directed force, and others tilt and axial bending between the insulation spacers under the influence of the axial force [1][2][3][4][5][6]. Once the transformer winding is damaged, it is very difficult to repair on-site and will have a great impact on society.…”

Section: Introductionmentioning

confidence: 99%

“…The calculation model of the transformer winding is shown in Figure6.The 2-D FEM has enough accuracy in the computation for axisymmetrical electromagnetic fields in the transformer. The standard condition is derived from Maxwell's equation: ∇ A = 0, and the governing equation is the vector Poisson equation, given as[3]…”

mentioning

confidence: 99%

Evaluation of ability to withstand short circuit and development of large capacity 500 kV autotransformer

Tan

et al. 2022

IET Electric Power Appl

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Once the short circuit damage accident of a large capacity 500 kV transformer occurs suddenly, it will seriously affect the safe operation of the power grid. The article expounds on the calculation principle and evaluation method of the transformer's ability to withstand short circuit, then introduces the design structure of 400 MVA/500 kV short circuit autotransformer and calculates the electromagnetic force and evaluates the ability to withstand short circuit under high voltage ‐ medium voltage (HV‐MV) and medium voltage ‐ low voltage (MV‐LV) conditions. By comparing with typical 110 kV and 220 kV transformers, the short‐circuit characteristics are analysed, the control strategy is proposed, and the largest capacity short circuit prototype with 400 MVA/500 kV autotransformer is developed. Last, the sudden short circuit test is carried out in the large current test centre. The results show that the large capacity autotransformer passed the big current impulse under HV‐MV and MV‐LV short circuit conditions for the first time in the world, and all indicators are good, which confirms the accuracy of the strength check and the effectiveness of the short circuit evaluation method and also proves that the 500 kV autotransformer has strong strength to withstand short circuits.

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“…According to research of winding deformation mechanism [12][13], deformational state of winding includes loosened state and deformational fault. The deformational fault of winding is not instantaneous, but a process of gradual deterioration.…”

Section: Introductionmentioning

confidence: 99%

Monitoring Method on Loosened State and Deformational Fault of Transformer Winding Based on Vibration and Reactance Information

Cao

2020

IEEE Access

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In order to monitor loosened state and deformational fault for transformer winding, the monitoring method based on vibration and reactance information is proposed in this paper. Theoretical models of winding deformational state with vibration and reactance information are established and calculated. Multi-information monitoring model is established, which include vibration and reactance information monitoring method. Multi-information integrated monitoring strategy is proposed. The CEEMD-energy entropy transformation method is proposed to extract vibration feature information, and reactance feature information is extracted by reactance identification method. Aiming at a 500kVA, 35kV transformer prototype, experiment of short circuit current impact is carried on, three types of deformational windings including radial extend in middle position, axial stretching loosened and coil folding in end position are developed. Monitoring experiment on loosened state winding after multi-short circuit current impacts and three types of deformational fault windings are carried on. The monitoring results are consistent with the actual deformational state of transformer windings. Loosened state and deformational fault of windings can be monitored by proposed monitoring method based on vibration and reactance information effectively, which provide basis for multi-information monitoring.

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An Investigation of Winding Curvature Effect on the Mechanical Strength of Transformer Windings

Cited by 11 publications

References 8 publications

Methodology to Evaluate the Electromechanical Effects of Electromagnetic Forces on Conductive Materials in Transformer Windings Using the Von Mises and Fatigue Criteria

Methodology to Evaluate the Electromechanical Effects of Electromagnetic Forces on Conductive Materials in Transformer Windings Using the Von Mises and Fatigue Criteria

Evaluation of ability to withstand short circuit and development of large capacity 500 kV autotransformer

Monitoring Method on Loosened State and Deformational Fault of Transformer Winding Based on Vibration and Reactance Information

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